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Microstructure and magnetic susceptibility of as-cast Zr–Mo alloys

Paper ID Volume ID Publish Year Pages File Format Full-Text
1676 88 2010 6 PDF Available
Title
Microstructure and magnetic susceptibility of as-cast Zr–Mo alloys
Abstract

The microstructures and magnetic susceptibilities of Zr–Mo alloys were investigated to develop a Zr alloy with a low magnetic susceptibility for magnetic resonance imaging (MRI). The microstructure was evaluated with an X-ray diffractometer (XRD), an optical microscope (OM) and a transmission electron microscope (TEM), and the magnetic susceptibility was measured with a magnetic susceptibility balance. The α′ phase with acicular structure was dominant in Zr–1Mo alloys, while the ω and β phases with the equiaxed and relatively flat (no acicular) microstructure was dominant in Zr–3Mo. The mixed microstructural features of Zr–1Mo and Zr–3Mo were observed in Zr–2Mo, which consists of the α′, ω and β phases. The β phase is stabilized when the Mo content exceeds over 3 mass% Mo. As-cast Zr–Mo alloys showed a minimum value of magnetic susceptibility at 3 mass% Mo, and the value abruptly increased up to 10% Mo before remaining stable up to 15 mass% Mo. XRD, OM and TEM revealed that the minimum value of the susceptibility was closely related to the appearance of the athermal ω phase in the β phase. As the Mo content decreases from 3 mass%, the α′ phase appears with the ω and β phases. On the other hand, as the Mo content increases from 3 mass%, the β phase increases and the ω phase decreases. Thus the appearance of the α′ and β phase leads to an increase in magnetic susceptibility. The magnetic susceptibility of as-cast Zr–3Mo alloy was almost one-third that of Ti–6Al–4V, which is commonly used for medical implant devices. Zr–Mo alloys are useful for medical devices used under MRI.

Keywords
Zr–Mo alloy; Magnetic susceptibility; ω Phase; α′ Phase; β Phase
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Microstructure and magnetic susceptibility of as-cast Zr–Mo alloys
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 6, Issue 3, March 2010, Pages 1033–1038
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us